The D3 is a better camera for low light and fast focus. It has lower noise at all ISO settings. Buy with confidence as long as you have the glass you need,

I love the new D4S coming out. It will lower the D3S price for me.

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"Transport is a subtly political business. Left-wingers like trains(central planning, low fuel consumption, largely egalitarian seating).Right-wingers like cars (freedom, independence, individualism). Onlythe bicycle crosses the political divide: it embodies both libertyand equality." This is the first paragraph from a short article titled"The Bicycle is Best" by Emma Duncan

Those who shoots with the D3s (sports guys) like me didn't replaced it with the D4, and probably will not buy the D4s because there isn't any justification to get it to improve in frame rate or pixels. We are happy with the D3s. Need more pixels for shooting flexibility? I got the D600 hanging around. You will see the D3s natural progression of depreciation, but I doubt there will be a big price drop for a used D3s when the D4s comes out.